几何 GEOMETRY
1.角
alternate angle 内错角 corresponding angle 同位角 vertical angle 对顶角 central angle 圆心角 interior angle 内角 exterior angle 外角 supplementary angles 补角complementary angle 余角 adjacent angle 邻角acute angle 锐角 obtuse angle 钝角right angle 直角 round angle 周角 straight angle 平角 included angle 夹角
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